allyric....

Congratulations on your purchase and welcome to the thread. You are welcome here.

The 70 Surpas will certainly fly your airplane. It may even hover if you are near sealevel. But it won't be a powerhouse. If you haven't purchased the engine yet or if you can get hold of a different engine I'd do it. Most seem to like the Saito 82 or for the power mongers, the Saito 100. The Surpass won't turn a 14x4 prop. Probably a 13x4 would be the best prop choice.

The more serious the aerobatics, especially 3D, the stronger the motor has to be. I don't think you'll ever realize the full potential of this airplane with that engine. That said, I think you will still love it, even with that engine.

Another area is servos. Many are using standard servos with this plane. But again, if you want to get the most from it you'll should step up in servo strength a bit.

Yes, you can use a 6 volt battery pack with the 9 CAP.

Good luck and if you have any other questions...there will be many that will help. Just ask.

Thanks
Barry